Description:Our guitar tuner has a built-in rechargeable battery. You can use the USB cable that comes with your PC or power bank to quickly charge it. With a single charge, it can be used continuously for more than 10 hours. After 5 minutes of no signal, the violin tuner can automatically shut down to save power; High-sensitivity vibration-based tuning, even in the presence of background noise, can ensure that the instrument is finely tuned in the flash. The clip on guitar tuner has the function of attention key, which can meet the needs of the most professional guitarists. You can place the screen in any way you want. The ukulele tuner has hardly any boundaries and has a large color LCD display that can be easily read even in dark environments. When the unit is in G (Guitar) tuning mode, briefly press this button to switch between guitar tuning (DROP D, OPEN G, OPEN D, OPEN E) and flat tuning (b, 2b). Specification: Color: show as pictures. Material: ABS. Size: 4.9x2.6x4cm.A4 Value Range: 440Hz.Tuning Items: Twelve Equal Temperaments, Guitar, Violin, Ukulele. Tuning accuracy: ± 1 Cent. Battery type: built-in rechargeable lithium battery. Note:There may be a bit of color distortion due to the different resolutions of your computer. There may be slight errors due to other manual measurement. Package Included:1 x Tuner.1 x User Manual.1 x Certificate of Conformity.1 x Micro Interface Charging Cable